Image processing apparatus for primary color and spot halftoning
AssigneeRicoh Company, Ltd.
InventorsYuuki Sagimori, Akiho Watanabe
Life of this patent
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Abstract
An image processing apparatus includes processing circuitry. The processing circuitry is to acquire image data including primary color image data for primary color and spot color image data for spot color; generate primary color halftone data representing the primary color image data as a group of halftone dots, using a primary color screen specifying cyclic arrangement of lines of halftone dots; and generate spot color halftone data representing the spot color image data as a group of halftone dots, using a spot color screen having a second phase that is different from a first phase represented by the cyclic arrangement of lines specified in the primary color screen.
Claims9
An image processing apparatus, comprising:
- processing circuitry configured to
- acquire image data including primary color image data for primary color and spot color image data for spot color;
- generate, from the acquired primary color image data, primary color halftone data representing the primary color image data as a group of halftone dots, using a primary color screen specifying a cyclic arrangement of lines of halftone dots;
- generate, from the acquired spot color image data, spot color halftone data representing the spot color image data as a group of halftone dots, using a spot color screen having a spot screen frequency, a spot screen angle, and a second phase that is generated by shifting a first phase represented by the cyclic arrangement of lines specified in the primary color screen to the second phase;
- and
- output print data including the generated primary color halftone data and the generated spot color halftone data.
An image processing method, comprising:
- acquiring image data including primary color image data for primary color and spot color image data for spot color;
- generating, from the acquired primary color image data, primary color halftone data representing the primary color image data with a group of halftone dots, using a primary color screen specifying a cyclic arrangement of lines of halftone dots;
- generating, from the acquired spot color image data, spot color halftone data representing the spot color image data with a group of halftone dots, using a spot color screen having a spot screen frequency, a spot screen angle, and a second phase that is generated by shifting a first phase represented by the cyclic arrangement of lines specified in the primary color screen to the second phase;
- and
- outputting print data including the generated primary color halftone data and the generated spot color halftone data.
A non-transitory computer-readable recording medium with an executable program stored thereon, wherein the program instructs a computer to perform:
- acquiring image data including primary color image data for primary color and spot color image data for spot color;
- generating, from the acquired primary color image data, primary color halftone data representing the primary color image data with a group of halftone dots, using a primary color screen representing a cyclic arrangement of lines of halftone dots;
- generating, from the acquired spot color image data, spot color halftone data representing the spot color image data with a group of halftone dots, using a spot color screen having a spot screen frequency, a spot screen angle, and a second phase that is generated by shifting a first phase represented by the cyclic arrangement of lines represented in the primary color screen to the second phase;
- and
- outputting print data including the generated primary color halftone data and the generated spot color halftone data.
Dependencies are inferred from the claim text.